What is your source for that figure?
The Argus consistently reported the fee as "about £2million" Ulloa completes Albion move and Ulloa ready to live up to top billing
and so did the BBC - Brighton & Hove Albion sign Almeria striker
It appeared in an article on Saturday January 19 2013, when they reported that the Albion had restricted Almeria to a sell-on fee "believed to be 5-10%".
Yes, but it wasn't very much. The local PNE newspaper reporter tweeted it as "token fee up front, more loaded on the sell-on clause."
When someone else tweeted "probably 100 - 200k plus sell-on %", the reporter tweeted "think 100k is a bit generous!".
If I had to guess, I would have a stab at...