If the stupid rich want to cough up 6000 quid of real world money for a ship which would take literally months of gameplay to earn then those ones probably want to demonstrate superiority over dolts who coughed up 300 quid of real world money for some advantageous equipment, who in turn want to show off to people with the 120 quid account.
Fortunately, the galaxy is big enough for those ones to show off to one another without imposing "weapons effectiveness inflation" on the rest of us. Either sending them to their own "posh toffs enclave" on the other side of the galaxy or having their reality only tenously linked to the one which we see and only if a button to opt in is ticked would be possible. Playing with bought credits could automatically shift the player default settings to share a galaxy with people in a comparable spending band.
That way, a well chosen and skillfully used purchase could go head to head against the stupid rich and toast them.
The thing is in two or three months time the hardcore players who dont buy credits will be at that level anyway, and new comers will be facing the same odds even without bought credits.
I wouldnt be surprised if on the first day there were over 1000 players already equipped with beam lasers on their cobras (from the pledges) that could take down such players by grouping up if they start causing trouble.