Well it looks like a big can of worms has been opened so heres my 2c.
Do i think its good value and something I would recommend to a beginner? Definately not !
From where I sit, his ad should be acceptable provided the ad is not deliberately misleading eg. quoting an inflated R.R.P.
An opinion such as "I think this telescope is very much suited for a beginner ", is just that, an opinion and there are plenty of people around to ask for a second one
In short assuming he is not breaking the TOS, I feel he has a right to try to sell a scope at a price that he chooses to ask, as long as there are no deliberate misrepresentations.
On a positive note, creating a discussion thread on the merits of an item for sale is something I would like to see happen more often.