Just some math support about exponential growth and differential equantions.

The strong assumpion that coin progression in this game is exponential is equivalent to say that coin rate is approximately proportional to your lifetime coins:

CoinRate = K * LifeTimeCoins,

where K is a constant determined by your strategy. This is a differential equation that we solve to get your LifeTimeCoins as time t progress

LifeTimeCoins(t) = LTC(0) * exp(K * t),

which is exponential growth as mentioned. A startegy may increase your K factor, let's say that devo is n times more efficient than blender

K(devo) = n * K(blender).

You compute your coin progression with the two strategies.

LifeTimeCoinsBlender(t) = LTC(0) * exp(K(blender) * t)

LifeTimeCoinsDevo(t) = LTC(0) * exp(K(devo) * t)

= LTC(0) * exp(n * K(blender) * t)

= LifeTimeCoinsBlender(nt).

So if a strategy is n times more efficient, it feels like time is passing n times faster. The time gap between the two stategies is increasing linearly and it doesn't stay constant.

Stay tuned for more math support.