Russian - Who is your online broker? How much commission do you pay per trade? Do they give discounts (or other benefits) to high volume traders like yourself?
I use the trading platform provided by Charles Schwab, StreetSmartEdge, for most of my accounts.
Awhile back I put my largest account with TDAmeritrade just so that I would not have all of my eggs in one basket, so to speak.
TDA provides a platform called "ThinkOrSwim."
Schwab's standard fee is $8.95/trade, buy or sell. They charge me $6.95/trade.
TDA is $9.95/trade. I pay $7.95/trade. While TDA has my largest account, that account is part of my non-frequent trading portfolio so the slightly higher fee by TDA is not important since I do so few trades in that account.
(or other benefits
Well, when I moved my one account to TDAmeritrade they had a promotion at the time giving gift cards based on the balance amount transferred to them.
I got $2,500 in gift cards ($1,000 to Home Depot and $1,500 to Best Buy.) That's the only benefit I got for moving the account to them.