Depends - do you include synths that dont have keyboards as keyboards lol.
I have 5 sound sources - that is 2 keyboards (an RD2000 and an FA07 - though thats changing next week to a Fantom 7). I then have a legend organ module, a Novation Peak synth, and a Virus Ti2 desktop synth.
As a comparison I have 5 guitars as well. A Fender Strat, a PRS, a Suhr Modern, a Tom Anderson Cobra and a Martin 0028 acoustic.
So Im pretty much on par as a guitarist and as a keys player. I also have my sound source for my guitars as well of course, in my case a Fractal AFX, and I know many who have multiple amps.
Have to say though - my guitars cost more than my keyboards, but they do kind of line up:
Roland Fantom 7 £2600, Tom Anderson Cobra £3200 (new price I got mine used for £2300)
Roland RD2000 £1800, PRS Cu 22 £2000 (though that was in 1999)
Virus Ti2 £1400 (new price, I got mine used for £750), Fender Select Strat £1500
Novation Peak £1000 - Suhr Modern £2000 (new price I got mine used for £1400)
Martin 0028 £2100 (new price I got mine used for £1100) - Legend EXP organ £550
FA07 cost me £1000, my AFX cost me £2000
Total guitar spend (prices I Paid):
Guitars Rig - £10200
Keyboard rig - £7700