Same reason you are I'd imagine, to make money. I've 10 bagged and sold half day before the placing. Encouraged by the way the market absorbed what I thought was another weak raise. Still think this has legs and enjoying the ride. Hope you do too.
The cynic in me says they got the raise away while the masses were still here to swallow it and sentiment was high. Shareholder consideration has not been their strong point to date.
I genuinely think the HE1 rerate that's occurring will go down in AIM history with the others we've all heard of. Don't risk your golden tickets for few percent!
Remember people sell then post on here seeking validation and to convince themselves it was the right thing. Someone bragged about 30% last week! Smart money still holding or buying.