Actually the price for FA*2870 is only around or even lower than $1000 nowadays, at least from the fleabay. If it's over $1100, it's pretty hard to sale. That's my observation
I got mine for 1k, and I think it's worth the cost. Think about how much the Canon/Nikon equivelent ones sold for, and they are still in production (while Pentax FA* are out of production, less supply w/ higher demand, thus higher price).
I've had the Tamron and Sigma equivelents before too, they are optically very good, but I can't say so in other aspects (built quality, look and feel, and not a Pentax).