Yes you about have to pay someone to take Tiagra for sure! Just stating the obvious on that one. Not that is is bad stuff all that much.......just is what the market dictates for sure.
I can't even get a Rival FD and RD sold and all together asking less than $60 or so for the two total! So there you go........some model componetry just has no resale value or much if any.
I say if you are not needing money then wait until around March when it starts to warm just a tad to sell the bike. Just my 2 cents.