In the local newspapers in Westchester County there is an article about a franchise that is relatively new to Westchester that claims to have attracted lots of agents and now claims to have the largest inventory of listings in the area. Years ago before a lot of the shifting in this industry, before lots of smaller offices were gobbled up and certainly before the internet I understood the importance of market share to both the broker/owners of offices and to agents. Used to be greater market share meant more advertising and that meant that the phones would ring more. For agents doing floor time and trying to build their business and have clients that was a good thing.
Now with the internet it would seem that floor time is a bit diminished. Agencies with loads of listings in a slowing market are enduring high advertising expenses. If you are selling is it better to one of many listings, do you get the same attention? Or is it better to be one of one or two. Do you get more attention if you are not with a very large agency. Yes you do. What does market share of an office do in terms of selling your property. Buyers are finding you online. Or in the newspapers. Do they care that your listing office has a market share. Probably not. They just want to find a home.
Is market share important? Or is the experience of your agent important? I would go with experience. The agent is the one who will be the captain of the ship. Market share won't help sell your house.
Agencies now are trying all sorts of things to impress the public. It is business after all. #1 IN MARKET SHARE,
#1 in VOLUME, #1 OLDEST AGENCY IN >>>>whereever, etc. The public must have a hard believing any of this hype. And what does it really matter anyway. So here is my hype:

Miriam, there is a listing right next to my house which as an agent I had solicited. I told them that I would take it as a personal responsibility to make sure their home got sold. Instead they went with a high volume agent in a big franchise. The franchise does huge ads touting how many homes they sell.
Four months later the house is still sitting there unsold. Is it better to pick the right agent, or a famous franchise? I know what my answer is, and it sounds like you would agree.