They are too expensive
Use the DNS service of your registrar. Most do offer round robin nowadays. Bulkregister does, enom too. Both are reliable, can easily deal with high volume queries, allow short TTL times, and yeah... they are FREEEE
If your domain is stuck with a registrar that doesn't have DNS hosting and you do not want to transfer the domain to a registrar that has DNS, then try powerdns or zoneedit.
Powerdns does 5 domains for free, even with high volume queries and was always reliable for me. They seem to forward emails slow though, in case you want to use their email service as well
BTW good choice to use 3rd party DNS. Everyone should do it
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