Tricky! From a UK perspective, these are still good speakers. They work with everything though the displays are not going to work with BV10s. Condition is everything and if in good condition and no problems with the drivers, £1000+ is possible.

Beolab 3000s are interesting! These are very sought after as they are elegant and not as dominating as the larger 5000 so will fit almost anywhere. I got mine from a B&O dealer for £250 some years ago but they will reach far more than that. Again condition will be a huge factor, but I would aim for £750 if perfect. In my view, a pair of 4000s are much better though!

I don't fundamentally disagree about the Pentas 3, perhaps $1600 is bit high. I've seen them go for less on ebay. Of course as Peter says condition is everything. The problem with getting this price is shipping. By the time these are properly packaged and shipped, you're looking at $2,000+.

On the BL3000s shipping is much less of an issue, but I'm not sure that $1200 is the right price. Again, condition is everything, but I've followed the prices on these for many years, and I've yet to see a pair on ebay go for that much (BV3000 of course are much less expensive/desireable). I may be wrong since I don't have a way to track 100% of ebay sales, but it's my sense. On the other hand, BL4000 would definitely get close to this price, but still perhaps not quite this much.

Unfortunately the second hand market in the USA is not as strong as in the UK. For example, I don't think a business like LyfeStyle AV would be viable over here. Still, B&O prices for second hand equipment are incredible when compared to most other brands of AV equipment.

hrmm ok...  just kicking around the idea of selling them... the Penta 3's were bought used  from B&O Boston about 4 years ago and still are in excellent condition.  The BeoLab 3000's were just serviced by B&O Boston last month so these are again in excellent condition.  I still think that it is quite sad that my sister has to part with them but I really shouldn't take the penta's or the bl3k's because I don't have the space for them.