Tier 2 for now is fine you should be able to get 2-3 shards a day from store so means one every 2-3 days. They want to people to test raid system this is beta as well they want to slow growth so people can't run away before release. As well you cannot collect ore fast enough to level bots faster than that either way. I've been r3 a 3* every two days and barely get enough ore to take each bot to 30/30 by time I earn another 2x t2
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This post is from February during beta when it wasn't as available.