I think it's interesting that you get 1 UET (~.01 ETH)for every previous transaction. It's a problem because it encourage to wait until the last minute and try to get as many worthless useless tokens as possible. This is a bad strategy to get a successful ICO because it encourage the marks to wait and have time to think instead of committing as soon as possible.

Also, it's possible to get a side benefit from this, because instead of a big buying transaction you can split it in many small transaction and get additional worthless useless tokens. I'm not sure if this consumes more gas that is discounted. If you split the transaction in N parts the amount of additional gas is O(N) but the additional tokens is O(N^2) (at least initially), so at some point you must get more tokens. (I'd like to read a complete analysis about this, with the actual constants.)

Anyway, just in case: This is not financial advice.