Whether the remasters are a rip-off or not is up to the individual buyer.
I personally wouldn't pay £170 to get the new stereo set to replace my 1987 CDs - having listened to a couple of the remasters I don't think the benefits are worth £170. They sound better than the 1987 discs, yes, but for me it isn't £170 better.
And £200 for the mono set? No thanks!
If it had been remixes, then yes I'd definitely have found some way of getting the cash together to get a set - I think that would have been value for money. Or perhaps if mono and stereo albums had been presented on one disc, then that also would have offered better value for money.
However, there are many people on these boards who are very happy with their remastered albums and they obviously don't feel ripped off at all. Sales of the CDs seem to have been OK, with many Beatles albums getting back into the charts, so the record-buying public must think they are getting value for money also.