Because not everyone have technical skills and knowledge to invest in masternodes alone. I have a lot of friends who lose a lot of money with masternodes too! Some1 will prefer to deposit there and only get profit after that.
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In this lifetime, You don't need any technical knowledge and skills to run a masternode. Almost all masternode has 1 click installation script and there are more shared and masternode hosting services that that offer turn key solutions.
So there's no need for a investment platform for masternode coins.
If you dont have right information in which MN with HIGH ROI to invest, in 90% of times you will be scammed. Thats why there is a chance to avoid this, and only invest a little amount there
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. Its not like normall ponzi scheme. Its a website where owners can pay us with their income from our investments.