i think many choose to be alone because, whether they are prepared to admit it or not, they intrinsically know they are in a pretty dire and humiliating situation when the only way they can get someone to give them any attention is to pay them. whatever way they dress it up they will have a friend or lover or, in their minds a gf, only as long as they keep paying. what must that do to someone's self esteem? some can rise above this feeling, many can't, so choose to be alone. it is very sad and i would guess many are not very happy.