Personally, I am not a fan of web market place sites and, while I accept they speed up product search, viewing and delivery I feel the downside is they take people away from in-world stores which makes it less viable to maintain them. I speak with some experience having run a themed trader's market in Second Life for over three years now. I can tell you that three years ago my in-world sales were much higher than today while the traffic has gone through up's and down's but not changed nearly as much. I sell my own stuff and affiliated goods so I know exactly what the sales are. Many other role play venues also rely on market sales and rents to offset their sim costs just like I do but, for many - including some I know personally - they rely almost totally on renting plots. I have advised filling the empty plots with affiliate stuff to keep some revenue coming in and that works up to a point but, irrespective, sales are down by more then half what they were several years ago for all but the most busy regions, and even those are down on what they were.
I have more to say on the reasons why and what I think should be done about it here...
https://plus.google.com/u/0/co...
but suffice to say that a lot of merchant vendors are closing their in-world stores in Second Life which is hitting the land rental business just as hard as other pressures. Kitely is still a small commercial grid so it is unlikely they will experience the same problems that SL Market Place causes in-world trading in Second Life but if the grid grows and trading seriously increases then the Kitely Market place will hog the trade and keep people from using the stores as much. Sadly, too many vendors and merchants are just there to make money so market place sites suit them fine. No wasting money in-world on store fronts and, by the same token, they don't spend any of what they earn to help the economy go round. And that means they don't contribute to the community either. They are net takers and some of them are just there for the money!