If the point of moving the alliance redemption goals is to keep things from being too easy, they could implement a waiting period of "new alliance negotiation".
Leave the first 20 at the regular exponential doubling cost, but tier the bucks required after that and allot people "negotiation points" which will they will need to build up and apply in sufficient quantity to buy a new alliance. Say you get X number of negotiation point per cycle depending on your level or your number of preexisting alliances. Then you apply them to a chosen prospective ally like surging or taking a whack. But you have to do it gradually because you won't have enough points in a single cycle and need to keep coming back until your alliance is paid in full.
And if your prospective ally stops playing or someone you know joins, you could transfer the built-up points with a "negotiations ceased" penalty.
More allies & higher levels would need more bucks and points, but not at the current unscaleable doubling cost. And if unused points expire like surge points if not applied by end of cycle, then it would keep people from hoarding and cashing in all at once and reward players who more regularly checked into the game, even if only a few minutes per day.
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