This is actually a point to the contrary. If you have the same investors then they wouldn't care if the coin merges and would benefit more it it did. This means if an investor must hedge lower on one coin and profit from the other it is a wash anyways. It would only make their overall coin stronger since there would be only one instead of two coin for anyone else who is not an investor to buy. Then you can make progress with both coins as one and make a return equal to the actual demand for this market. Instead of splitting markets etc. in front of the same audience being the same exchange. Allowing one to fail if you own both means the other is good but you may need to hedge since you will sell off profits of the good and have losses on the other coin.