What do you think about this domains? - bostonmeta.com

They are brandable names. However, I would categorize them as class B; certainly not in class A for the following reason(s):

bostonmeta.com

- It is second-level themed; targeted at a local market. For an organization looking to make an impact at the global level, this name will not be first choice, unless the product they are selling has a compelling reason to be named as such. An example would be a name like hollywoodstudios.com. Even though the name clearly references a city in California (USA), the reach of the US movie industry is far and wide, with awareness of hollywood topranking.

riversidetravels.com

- Same argument as above

aivaluechain

- The is similar to the others in its second-level nature because of its technical orientation towards what seems like a business to business market. This factor clearly impacts the numbers. However, it is a perfect candidate for a B2B case where members may be ready to pay for services of some kind.

Conclusion:

Be ready to accept great prices for your domain names but do not equate them with the "top dogs" of the sales chart within the historical and current context.