50cents - $ 10 range for Chash, I am not too sure that is going to happen, particularly if the asking price for the miners do not change. If the price for the hardware remains the same the price cant go beyond 95 cents per coin. If it does go beyond 95 cents you would be at the same discount as boom. If it goes beyond $1 you would be better off ordering the hardware with bitcoin unless you could buy a heap of boom and order while the price has been pumped up buy a huge buy on boom coin on the exchange, but this would only work if the cleverhashes website honors boom coin at the price on the exchange at the time of order.
also remember the chash price is fixed at 0.00138125 so the lower price per bitcoin the better your discount, the higher price you pay for bitcoin eats into the discount.
right now bitcoin is at $ 351 so price is 0.4848 per chash for 52% off
if the price was $700 there would be no advantage, or the same as simply holding on to your bitcoin.
the only advantage to chash in regards to the hardware is the discount. Once there is no discount there is no advantage and there will be no demand.
There is no cap on the price of CHASH. CleverHash guarantees a minimum value of 1$ per CHASH if used for their miners. They do not set an upward limit. Keep that in mind. There are many reasons for investing. Guaranteed 50% discount for purchase of their miners is just one of them. It is only the floor.