It’s as good a place as any. As with all sales multiple good quality imagery is key as is knowing whether you have original or reproduction weapons. You can auction the item which saves you doing any research into value, and it should find current market value. Although as with any auction the final selling price is a lottery.
Alternatively you could try selling on here first but you would need to establish authenticity and determine a price through research or request.
I can't speak of commission rates for selling, but I have picked up a few pieces via Vectis who regularly auction full collections or groups of figures broken down into series / era. Individual last 17 always seem to do particularly well, as do single baggies and carded in all states. If you create an account on their website you can then search all past auctions to get a sense of the hammer price they attract, and worth bearing in mind they add 20% VAT on top to all buyers.