I haven't bought or sold anything on BAT yet, but I've spent some time there. For anyone who hasn't checked it out, you can find it
here.
Sometimes stuff sells for grossly inflated prices, but I've also seen some screaming deals. I think it's like any auction, real or online: success depends on the right person seeing it at the right time.
Land Cruisers in general are popular on the site. I see a ton of 40s and 60s cross the block. There have only been a handful of 70-series' in the last couple of years. I recall being a little disappointed in the sale prices. I think the sellers probably could have gotten a little more in a private sale with some good promotion and some patience. You can search past sales and maybe find something similar to yours for comparison.
Good luck. I would suggest submitting a TON of photos and being very active in the comments area.