Running a profitable lightning node

I’ve been running a lighting node for a couple of years with a total net of -260.000 sats. Now this poor result is mostly on me for not fully understanding the complex nature of operating a node successfully. Up until now, I figured it was worth being part of building a new payment system, but at this burn rate, I can’t see any reason why I should carry the costs for this anymore.

Are there any statistics on how many profitable nodes there are on the network?
Is there a minimum size of a node/channels to be profitable?
How many plebs like me are continuously losing sats?
Will the network be decentralized and secure without smaller pleb nodes?