I think you might be over valuing your game slightly.

Factory fun has a retail of $50 while Galaxy Trucker has a retail of $75.
You may want to take that into consideration.

As an owner of Factory Fun, I would be excited to see its value rise, but I don't suspect it has yet.

Actually, there was a discussion about the value of FF a few days ago in the Buying and Selling forum. It sounds like the value--at least according to the posters--was right around $70, as it is out of print, and will not likely be reprinted.

I know that an online retailer had a copy about a month ago or so, and sold in 2 days for $60.

(edit for spelling)

If you were to wait until the American release of GT (end of August I'm hearing, with fingers crossed), I bet you wouldn't have any problems making this trade.

I was setting the trade value based on that conversation in the Trade & sell forums, but I would be willing to sweeten the deal also.

If I have to wait until the American release, I might just buy it then and have both....

I will! There's no way I'm letting my Factory Fun go....

I knew something was up when I started getting trade offers from all over the place for my Factory Fun and I don't even have it listed as tradeable.

I don't really think value is your problem, its mostly that the people who want Factory Fun don't have a copy of Galaxy Trucker. I have been seriously considering paying for shipping from Australia +$60 just to get a copy of Factory Fun, but I could only offer my pre-ordered copy of Galaxy Trucker. Hence, my issue (and one I bet is pretty common).