Haven't started this one yet (just about to move house!) but the consigment shop was so flakey in wishmasters that I'm hoping for a patch. I didn't even start using it until about half way through, it's not like they needed the money but I just wanted to give it a spin since making money for the inventing career was so tedious, it worked for a couple of days and then nothing - no matter what I put up for sale it wouldn't sell. Sometimes I couldn't even get the buy window up, I found that taking everything off, quitting the game and reloading sometimes would get me another day of sales but its so completely random. I have some theories about what breaks it but nothing concrete. Justy taking the stuff off and relisting it didnt work, I even bought the consigment shop and added another till and that didn't help. The worst part is statues, when you cancel the consignments everything goes in the personal inventory but you can't sell or place statues from there (or I couldn't find a way) so I couldn't even sell them the 'conventional' way.
Most of my free time is spent packing at the moment but when I get some time I'm going to run some tests. If I find anything I'll share.