I think that's a fair guess. I'd also guess there are plenty of people who bought in at around 1k and are thinking to lock in at least some of the gains that were made over the last year.
Maybe they don't get 1,900% gains, but 1,000% gains or even 'only' 100% gains in a single year is still an impressive return on investment and so selling anywhere above 2k is going to be a viable choice for many speculators.