You don't really need that many more. Perhaps 10-15 is really far more than enough. 5 scapers allow 2 to be down and require 3 to agree to converge, 10 scrapers allow 4 to be down and require 6 to agree to converge. Remember the whole algorithm is designed to essentially make the scrapers transparent. The nodes do not trust individual scrapers. 25 and up is really starting to put on the load on the BOINC servers again, for essentially no benefit.

We also cannot be distributing the Einstein credentials to the entire network, or even a subset unless those people are validated, as that is not in keeping with their intended use of the credentials. Hence the scrapers will always be run by trusted members of the community.

I am all for having more, to a point. Would be happy for you to run one if you want Hive account@scalextrix.