I created a free account to search photos on Match.com. Quick searches showed statistically significant discrepancies:
Too many women are exactly 30 years old compared to 29- or 31-years.
Too many men and women are exactly 40 years old compared to 39- or 41-years.
Too many men are exactly 6'0" compareed to 5'11" or 6'1".
Many women have photos with bad lighting, other people, etc. It would be easy to get more appropriate photos with a digital camera. Then I realized their photos are probably 10 years old. That's why they don't get better ones.
Also, Match has profile fields for income and height, but not weight.
Too many women are exactly 30 years old compared to 29- or 31-years.
Too many men and women are exactly 40 years old compared to 39- or 41-years.
Too many men are exactly 6'0" compareed to 5'11" or 6'1".
Many women have photos with bad lighting, other people, etc. It would be easy to get more appropriate photos with a digital camera. Then I realized their photos are probably 10 years old. That's why they don't get better ones.
Also, Match has profile fields for income and height, but not weight.