Bitcoin can become stable only when each one of us stops measuring it in USD/CNY/RUB/whatever currency. It can be paired with eth and other cryptos though. Imagine 1 BTC = 1 house, while 1 eth = 1 Tesla. Only then it may become somehow stable. Until then, it's just a speculative asset, targeted to either gamble or destabilize the world economy.

The pool doesn't pay the bitcoin network commission for the transaction. I believe these satoshis you lack is the bitcoin network commission.

There is a thing I still don't get.
If any of pools declare to have a 4000+ BTC reserve fund (even 1000+ is enough) with a PPS payout - won't this pool get instantly attacked by miners (or even other pools) to get all of these funds?

It's on the main page, 0.00004148 BTC / TH/s currently. The calculator is at the dashboard section, you will probably have to create an account.

Just to add - I've been mining at the op since September 2018, and despite having a bad luck spree with blocks, they managed to make the payouts every day. So I do believe they have a reserve (no idea how big it is).
Furthermore, they proved to be the most profitable.
A friend of mine, Homeminer @youtube (not a product placement) has ASICs set up at different pools and he has a spreadsheet updated with every difficulty change (though it is in russian - there won't be difficulties with understanding it).

https://drive.google.com/file/d/12lZZfG_raBWe2NssfZDSo-sBBc8-3Qfr/view

Been mining btc at SigmaPool since september 2018. Absolutely stable with a really strong support. Furthermore they have some pretty firmware. Can't find any better payouts anywhere.
Not a product placement but a personal recommendation