Yes, let's compare, not on gut-feeling, but on actual numbers:
2000
pay-drivers (4): Burti, Diniz, Gené, Mazzacane
arguable (3): Zonta, Verstappen, de la Rosa
2001
pay-drivers (5): Burti, Marques, Yoong, Mazzacane, Enge
arguable (3): Zonta, Bernoldi, Verstappen
2002
pay-drivers (1): Yoong
arguable (4): McNish, de la Rosa, Bernoldi, Davidson
2003
pay-drivers (5): Gené, Baumgartner, Firman, Pizzonia, Kiesa
arguable (2): Wilson, Verstappen
2004
pay-drivers (5): Gené, Pizzonia, Pantano, Bruni, Baumgartner
arguable (2): Zonta, Villeneuve
2005
pay-drivers (3): Pizzonia, Karthikeyan, Albers
arguable (3): Monteiro, Villeneuve, Liuzzi
2006
pay-drivers (5): Speed, Montagny, Ide, Yamamoto, Albers
arguable (3): Monteiro, Villeneuve, Liuzzi
2007
pay-drivers (5): Nakajima, Speed, Albers, Winkelhock, Yamamoto
arguable (3): Davidson, Liuzzi
2008
pay-drivers (1): Nakajima
arguable (2): Piquet Jr, Davidson
34 pay-drivers in 9 years (3.8 /year) from 2000 - 2008
25 arguable in 9 years (2.8 /year) from 2000 - 2008
2009
arguable (2): Piquet Jr, Liuzzi
2010
pay-drivers (2): Chandhock, Yamamoto
arguable (3): Liuzzi, di Grassi, de la Rosa
2011
pay-drivers (2): Chandhock, Karthikeyan
arguable (3): Liuzzi, d'Ambrosio, de la Rosa
2012
pay-drivers (1): Karthikeyan
arguable (2): d'Ambrosio, de la Rosa
5 pay-drivers in 4 years (1.25 /year) from 2009 - 2012
10 arguable in 4 years (2.5 /year) from 2009 - 2012
Just shows even more how misguided this outcry on pay-drivers is.