And then there is the 'incrowd' which does everything they can to get rid of newcomers. All in all not too impressed with Bricklink in its current incarnation, the Lego group, which used to quietly promote bricklink has gone completely silent on them.
A final item about bricklink that I don't like is that they tend to sue or send C&D letters to other Lego related sites for the use of 'their' content whereas that content is all user generated, it's just that Bricklink overnight went from having all that content owned by the contributors to claiming copyright on images and terminology. They really pulled a Gracenote/Freedb stunt here.
http://www.thebrickfan.com/brick-owl-hit-cease-desist-letter...
Imo they don't have a leg to stand on with 'their' numbering system because it is based on Lego mold numbers to begin with.