You seem to be stating you see a difference in profits when you place buy and sell orders yourself rather than a pool which would sell the coins as they are mined then buy the alternate currency. If you are psychic and can predict what orders will be filled at various price levels in the future then there really is no need to mine coins at all, just profitably trade.
Pools are going to trade at the current buy price, lowering it with each sale. You're better off listing in between buy/sell if you want to maximize profit without dumping the price. But that's really irrelevant here.
Doing so would allow the price to not hit your listed orders, you could potentially make more, you could potentially make less. To state only one way or the other is fact is to claim you can predict the future. It is very relevant when your initial comment was about variance, and you go on to describe a strategy which adds additional variance.
When you use a profit switching pool, it's going to charge more in fees. On top of this, you have zero transparency. They could be paying you 70% of what you should be getting and you'll never know because you have no idea how many coins were mined and how many should have been. There have been pools in the past (at least in 2013) that went out of their way to obfuscate earnings to screw over miners. So not only are you paying increased fees, you're also risking more loss.
It sounds like you are stating that because some pools are scams, all pools are scams. I'm not saying anyone should choose one pool or algo over another. If a person can use a calculator they can know if their pool is being honest, they can also know which algo is the most profitable to mine with given their hardware. I'd merely suggest that any new miner run the numbers and not take forum posts as prophecy.
All I wanted was for CUDA miners to chime in and show some numbers, as Deravelas had his 400MHs pointed at my pool and I was not sure what the most profitable algo was for him. This was met with opinions and no numbers. I've since ran the numbers and it is clear what algo CUDA miners should be hashing.
Happy hashing guys