Let’s put it this way:
Let’s say every 1000 XVPs you buy are like a hen you bought.
Your hen (1000 XVP) will produce an egg (1 XVP) by staking feature every 5 days.
You buy 10 hens, you’ll have 10 eggs every 5 days.
Even more, you buy 100 hens, you’ll have 100 eggs every 5 days and assuming you collect the eggs, you will have a new hen in 50 days, which will lay eggs in turn.
Why giving away (selling) your hens you bought?