Yes, but we are not doing that here either. From the legal perspective, exchanging one coin for another implies a contract for the exchange of virtual goods (XEL, BTC) between me and a buyer. That also means that I have to decide what one XEL is worth arbitrarily. Let's face it, a XEL is worth nothing. We are not selling anything here, we do not want to be tied up in any contracts and we do not give any guarantee of success. You donate and our way to thank you is to give you a few worthless XEL that can be understood as a complimentary "early access" to our software, all without any sort of obligations from either party.