Hello!
For what it is worth, I have been trying rather hard to find a BTTF to buy and have been unsuccessful. If I have one offered to me for $900 I will buy it, assuming it is in decent condition and it is complete.
I would say that there are people who like a title even when others might speak unkindly of it. BTTF is like that for me. Thus if you get the BTTF and do not like it I would think you have a good chance to sell it. Who knows, I hope not but I may still be looking if that happens.
All the best in your decision!