I wouldn't suggest buying full tilts used because of the fact they have the intuition liner which means they will be fitted to that persons foot and wont fit you right. If you say you will pay just about anything for them why don't you just buy them new and have them fitted for your foot.
A used FT isnt any different from other used skiboots. The custom moldable liner is marketing bullshit because liners form to your feet after use anyway. The wrap around liners are also marketed by FT like theyve reinvented the wheel...theyve been around for quite some time and were designed people with fat calves.
Sure intuition is comfy and what not but they arent fucking magic liners created by wizards