Awesome... I just tried it and it works like a charm!
edit
Attention: be careful, don't send cards that are above their base-level, the bot currently pays the price for the lowest level cards on the market regardless of the level the card sent actually has!
In all honesty, it would have been an easy exploit if the bot paid the price for a Lvl2 Shaman on the market because that would be more than enough to purchase 3 Lvl1 Shamans and rinse and repeat... but it should still at least pay the price of three base XP cards!
2nd edit
Just received a bug-bounty! I applaud the positive and swift support.
RE: Introducing @monsuta, a bot that will buy your SM cards