Neteller is not a savings product, but one designed to fund online gambling. It is the acceptance of the Euro from non-EU players by casinos that would sway Russian players to select the Euro, rather than the Dollar, as their Neteller currency.
I have seen many casinos where the terms limit the use of the UK Pound to UK residents, and the Euro to countries within the EU, and where presumably their countries have adopted the Euro.
Given the above, for Russian savers at least, the Euro looks less safe than the US Dollar, which itself isn't necessarily the safest currency around.
Until casinos accept a wider range of currencies, many players are faced with choosing an alternative for their home currency, and whether this is the Euro or the US Dollar, it is a decision for them, and nothing suspicious should be read into it.
However, if a Russian player chose to play in the UK Pound, this WOULD be suspicious, but only in the sense that it suggests the player is out to "whore" the bonuses, rather than play "recreationally".
Seriously, it does. If you have 27 bogus accounts there then I'm surprised they are talking to you at all. If there was no provocation whatsoever and they just didn't like your birthday, or whatever, then maybe you've got reasons to grumble.
