I don't think it would've been a realistic expectation to have most or all your reflash amount refunded to you. Plus, development rumors have been floating about for the Si version of Kpro for months, years. It shouldn've been a dramatic surprise that they were planning on releasing one. It's not as though they were deceiving or forcing you into buying both.
I know, I guess it's just the dirty dealers fault and not the manufacturer. Personally I feel that they have had this for sometime and waited for the pressure from another provider (cobb) to release there's first and I don't know if their marketing was the smartest. I guess we will have to wait and see which systems works the best.