Well...if anyone is going to spend a bunch of TG for gear, that already takes out a chunk of 'long term motivation' or reward.
Don't talk about motivation or reward because you'd be a victim of your own consequence. (Well partially)
Is there any real competition going on? I'd assume it's only for a very small select group of people who actually manage to hit 140 on hardcore or kill Samael on whichever ladder. Whatever it is 'hardcore' players do. Most likely the main contender would be this individual called -Ben and various other forum regulars in awe and kowtow in a circle around him. That's how I imagine it anyway.
I play SSF on MP and sell whatever I don't need for TG. I have no use for TG. I just like to see the number get bigger. The same reason why some people get hooked to clicker games (lol).
I do think there's a valid case to sell Hell completed level 105 or 110 toons in the TG shop. Normal/Nightmare/Hell is more of a rite of passage than an actual challenge. Makes people willing to pay happy, makes people receiving the money happy as well no?