Yes but Bitcoin and Ethereum are crypto currencies who's value are open to the market for trading and profit making. Steemit on the other hand is a platform for content creators to provide unique content for others to enjoy and upvote based on quality. The Steem earnings are secondary.
I can create a post that is complete shite and then use a vote bot to get rewarded. As @stahlberg says, if this starts happening on a large scale then Steemit is finished as a platform.
There is a single guy posting 10 topics a day making 400$ on every one of them. Do you think OP boosting his posts for a few $ will destroy the platform more?
Of course not but if the main incentive by many here is to make as much money as possible then it will have a negative impact.
I have posted some crypto analysis articles but have made nothing from them, where as other articles which are all about pumping and dumping coins make loads of Steem. Says it all really.
Yeah i heard many people joing the pump and dumps make money and just upvote the guy for helping them.