You can google site which will tell you to answer. there also list at bottom of site that will tell you
Is that for Sythe? I though Sythe's traffic was on the decline. If by opening up you mean personal stuff, there's a fair amount of people that look at those sections. You can always edit/delete the posts in the future. As for the markets, just check whichever markets you're considering being a part of because they vary massively.
Definitely a really cool website to open a market in. Cool people and fun miniranks/discord to play with and other stuff. RS is also one of the biggest mmorpg's and sythe is mostly made of rs players.
Read it again it is, but only person who knows real answer is Richard these sites are just estimates. if you look at that graph it goes 25k at top and 35k at bottom (its backwards)