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BcDSGC is pretty slacked on 30-40-50 grade cards
http://cgi.ebay.com/1909-T206-tobacco-Hal-Chase-SGC-60-EX-New-York_W0QQitemZ8704110067QQcategoryZ57993QQrdZ1QQcm dZViewItem
then they tighten up on 60 grade + cards and seem more consistant there.
The above card would grade low end PSA 4. Don't know about GAI. The biggest difference in the two grading services,(SGC/PSA),is that PSA 4's usually do not have rounded corners. Many SGC 50 cards do! At the higher levels ALL three companies become more competitive with each other.