From the point of view of mathematics sending tconow for your services will cost more for the OP than the sum which he needs to send you. I wonder if he'll fulfill their commitments? For OP it would be advantageous to run your PC on mining and a few weeks to complete the accumulation of their own. In any case, I wonder how it ends.
I haven't the slightest idea why he suddenly has no mining rig but I do know how much of a pain it is to be stuck with a partial balance that you can't retrieve. I decided to take a chance and if it works out then the two of us get to have a +1 trust on our accounts which is a good payoff IMO vs the risk of losing ~0.02BTC in mining time.