If a Wildblue system, the equipment has little residual value unless it was leased - in that case it has value to ViaSat since you'll be charged a hefty $150 each for both the modem and TRIA for failure to return (most people purchased it outright to simply avoid the monthly lease fee).
I'll see them occasionally offered on eBay - maybe they have some value to installers tasked with supporting Wildblue for spare parts, but would not be usable by consumers purchasing them there unless looking to re-purpose the dish as a bird feeder or wok.
If you go back (and not suggesting you do since that's your choice), you'll likely be pushed into the Exede service and require new equipment anyway - not even sure Wildblue is being offered anymore since all areas not covered by ViaSat-1 are augmented beams on the older satellite and offer the slower Exede-5 service.
While there are some Wildblue subscriber holdouts, mostly they appear to be those who got in on the government subsidized recovery act plans, which are not applicable to Exede plans and no longer offered. Once you give those up, they're gone forever (if you could qualify for them the 60GB plan was attractive but for some reason unknown to those inside the DC beltway we always seem to run out of other people's money).