Artists need a lot of collectors, all kinds of collectors, buying their art.

Being an art buyer these days is comprehensively and indisputably vulgar. It is the sport of the Eurotrashy, Hedge-fundy, Hamptonites; of trendy oligarchs and oiligarchs; and of art dealers with masturbatory levels of self-regard.

Lots of ambitious work by young artists ends up in a dumpster after its warehouse debut. So an unknown artist's big glass vitrine holding a rotting cow's head covered by maggots and swarms of buzzing flies may be pretty unsellable. Until the artist becomes a star. Then he can sell anything he touches .

The art critics on some of Britain's newspapers could as easily have been assigned gardening or travel, and been cheerfully employed for life.

There are no rules about investment. Sharks can be good. Artist's dung can be good. Oil on canvas can be good.

The most abiding memory of visiting Lucian Freud's studio were his eyes, with the gimlet gaze of a Hooded Falcon. But he made for very relaxing company, quick to be amused at the world and his own peccadilloes. He enjoyed the seedy squalor of his rooms in a posh house in the most desirable part of Holland Park, and living up to his persona as an oddball bohemian.

I don't buy art in order to leave a mark or to be remembered; clutching at immortality is of zero interest to anyone sane.