It's OK, nothing wrong with that.
In fact, if you are RICH and somehow managed to get all that awesome gear without spending a single cent, it means 3 things:
1. Youre a gold digger and got your stuff free from people.
2. You have no life and spend countless hours grinding, crafting, and merchanting.
3. You're either a kid not old enough to get a job, or a lazy unemployed adult.
Im not at all endorsing that all of us bust out our wallets and spend a gazillion bucks on SK. If you do that, thats just as worse as pretending to be F2P. All I'm trying to point out is why do players with awesome gear like Max UVs and expensive costumes etc panic and immediately say theyre F2P?
Same reason why you wouldn't show a wallet full of cash in public.