Lets face it people are playing plastic crap out there & enjoying it so what the heck does it matter......too much is being put into this 61/76/88 key thing IMO...
Are you going to sound better with it? willing to schlep the extra weight? Are your fingers aching after a gig due to the key-weight? Can you effectively use the articulated sounds properly with Piano style, or semi weighted keys,..........

what will change in YOUR music if you had 76 or 88 keys?