Thats an old site, if you want to invest on there, then i suggest you are not doing it. They already listed on badbitcoin.org bad list, so better avoid it.
You maybe want to check this article
From [Investment Warning] Bitclub Network Review and Analysis

Its looks like ponzi, but idk why they have their own pool https://www.blocktrail.com/BTC/pool/bitclubnetwork.