Say you mine a bitcoin in solo mining
Is the 6.25btc block reward validated to your account?
Because if not you forfeit $280,000 by pool mining...
If you are solo mining and against the massively sizable odds against finding a block, you get one - yes you get the full reward + all tx fees in it and - whatever fee the service (pool) you use charges. Key point is that as I said depending on your hash rate and above all - Luck - you
might find the block within an hour or more likely years or possibly NEVER.
Using PPLNS with the much higher hash rate a pool provides you will get paid far sooner and certainly more often. Sure you split the rewards. So what - you are at least making
something and on a much more regular basis.
edit: I might add that the only way to have a pretty predictable income from a miner is use a PPS pool that pays a fixed daily income depending on your hash rate. Of course they charge a hefty several % of your raw income for using their services.
That's all the choices a miner has. Period.