The power of money in the Premier League, and the money people are willing to gamble to get to the promised land. I don't imagine he'd ever heard of Brighton. In sane times, it is ridiculous to think a player from a club like Boca Juniors would be signed by a second tier English football club...
You have to say Boca could have royally screwed up here. They have an asset worth £10m or so, and they have let his contract run down to 6 months is it ? So he can leave for nothing. Whether they need the money now or not, they could potentially be flushing £10m down the toilet