Alright guys could I get a little help understanding this better?

I'm using Hyperliquid atm and would like a little help understanding this better,

When my position gains value it says I can use the money from my profit to buy even more (without closing my original position) which increases my liquidation price and my PNL line, Is this actually better than not doing anything at all or is this just f n' my own ass? Thank you.