I believe adding "gold charge" to spells is so completely seperate an "issue" to time compression as some kind of "quick fix" if a spell is more powerful and gets a longer duration as a result, or whatever, really cannot be a justified quick fix-and-be-done-with solution to balance it all out.
I think "Spell charging at casting" must be completely dealt with seperately, and the counter balance must also have something relative and relevant involved, like other ways gold is sunk from non-casters, etc (how could a system be well balanced this way I do not know) - i don't know, a counter that calculates how amny HITS a suit of Armor takes, and Sheilds, and after 200, well lookee there, your armor is "not as good anymore" (-1 Armor/Defense), and must be fixed? i.e. the "durability" factor.
Case now in ALFA? Fighter level 2 gets his Full plate armor! Woohoo! By 10th level, it's been hit 23,956 times with slashing/bludgeoning/piercing weapons, fireballed, splashed with acid, rained on, pissed on, rolled down hills, dropped from 40' heights, burned, clipped, cut, pummeled and drenched for YEARS... but is still 100% fine, and has cost the Fighter... ZERO gold in upkeep? Comon.
OR!........
....the spell charge "thing" be left out completely as the balancing element against the time compression thing.
Of course, if it is that much of an issue for some, that if PnP spells that should cost "considerable" gold cost to cast, must be addressed, it should be handled seperately with relevant balancing fixes for non-casters (like the durability thing for example - yes, not perfect, but it was just an example).
STOP READING IF YOU CARE NOT FOR OFF TOPIC (partial off-topic?) COMMENTS:
Skills and their "use":
I use skill rolls very often, and most others in closed RP sessions (non-DM'd), reciprocate very often with me. I think they are of paramount importance, and many a decision I (OOC) would not want my PC to make HAS been altered in game (RP instances) due to opposing skill rolls by other PCs with no DM around. "Usually" altered action is creative and to promote more fun RP...
In years of doing it, not one person has ever "Disagreed" openly to following quite closely to that "unwritten honor system" of playing along with the skill roll result realistically within those instances.
IMPORTANT: None of those hundreds of instances 'really' meant life or death, so that argument does not fit 100%, because if it meant life or death somehow, or even say a sizeable amount of gold, due to a skill roll, i'm just not sure how far it would go based on skill rolls... but now-a-days, with the ever growing decrease in allowable CvC etc, skill rolls are (as i see it) and I assume will be taking on a much bigger and more influencial part between players RP'ing outside of DM'd sessions. Since it is slowly becoming the only "PC/PC allowable conflict" 'sort-of'...and some people really seem to enjoy that especially the more hardcore realistic you want it.
Example #1 comes to mind: PC1 power levels Intimidate Skill. By 3rd level with feats, etc, the modifier to Intimidate could be pretty much (and dare i say) unrealistically high when the chips are down?
(conservatively??...
+10?)
PC1 demands 2000 gold from PC2 on the road.
(((And it's not hard to make a 15-20 roll anytime. roll 16? 16+10= 26....(3rd level PC) ))
Counter d20 rolls to that, no matter what they are, can just as easy be 1-5. The counter roll modifier would in most cases would be low!
(since first of all PC1 might approach with demands, a PC who most likely 9 chances out of 10 does NOT have a skill leveled that would be of any use against an intimidate skill roll).
Conservative average?? +5? Roll 4? 4+5= 9.

And more often than not i am bettin' +5 is being very generous.
Now, whatever level PC2 is... and it could be any level - many (not ALL!) players maximize other skills!
Might even be HIGH level.
He/She just suffered an intimidation by a 3rd level PC... at a "conservative" 26 vs. 9.
Will that PC hand over the 2,000 gold? hmmmm
If he/she does not pay, and because of any level of meta knowledge present, just decides to SMASH PC1 into the ground because "the rules say PC skill rolls without DM present need not be heeded"...is that cool?