Does it make any difference if I grade this?

[G1911]

Another reason not to grade, if one is not planning to sell in the short term, is that you may need to regrade later to get your profit. There is a price differential for older graded cards already, and it is a very real possibility the market changes significantly in the next few years. With CSG rising, the almost inevitability of AI based grading removing the viewer from the occasion, if you're selling in 10-15+ years that PSA slab you have right now may not be the slab you or your heirs will want to sell it in. You might need to crack and submit to someone else or an AI service, or send back in and pay a fee to get it into a modern holder (though the serial would still give it away it's an older grade with different standards).