[1880nonsports]

hope all is well with you and wife. Don't get me started showing off some of PSA's horribly graded disasters - that's a seperate thread :-)
The OP's card is mis-graded as it is an obvious good at best. Your example has a beautiful appearance for the grade. That said - the classification of VG has some fairly broad parameters. Different technical issues cause a card to be graded as such - issues that may or may not contribute to the demand and price. Additionally each TPG determines what their grading standards are - and one may allign with one over the other for a miriad of reasons.
I think the issue here was a valuation not that SGC clearly overgraded a card. For this particular card I think my guesstimate of 75. as the low end of my range is about right as well as understanding the 250. or so you got for your example is with allowances for the intangibles.....

edited to note that while in my earlier post I said it wasn't a terrible VG - I was trying to be just a bit kind to the OP without knocking down the card itself too much while still offering an objective valuation. Since Jerry opened the door - I just wanted to clarify that I don't grade the card as VG - and I am not a TPG. While my grader of choice is SGC I have ungraded cards as well. All grading is subjective and all TPG's make mistakes.