@Ki Lee the two biggest crimes I've seen investors do are: abusing concessions and wholesale chaining.
Both of these methods ruin relations that investors have with either realtors or wholesalers.
Abusing Concessions: Some groups, even ones that are here in BP, teach that you get the property undercontract no matter what and then in the inspection period you come in and push the price lower, substantially lower. If you are an investor you know you need to pay for paint carpet and repairs yet these investors don't include that in the price and in concessions then try to get the price of those things taken off even when it is advertised as a investor opportunity and sold "as is". Once the property is undercontract it hurts the seller to put it back on the market because it gives the perception of "the house has problems" because its been on the market long and someone back out. Anyway the relation with the realtor is ruinned because they've worked with you to get a house undercontract with a price you agreed to and then you are instantly changing your mind and have left them high and dry to communicate your new demands to a party that thought everything was good. Its fine to ask for concessions but that is for things that you didn't really anticipate like replacing all the electrical or plumbing not for "kitchen needs to be upgraded".
Secondly, wholesale chaining is when a wholesaler gets the assignment of another wholesaler who then tries to assign the assignment and so on and so on. Each greedy party taking a slice of the pie till there is not enough left for the end buyer then the whole chain collaspes. This ruins your relation with wholesalers because they offered you a great deal but you decided hey I'll take a little wedge off of this and someone else will still buy this. I will state though that wholesale chaining can work when there is an understanding of what is happening but most people prefer to say I'm sorry rather than ask.
As I stated in my first statment its not that some investors are unethical (these can all be legally done) I would argue its less ethical due to an individual not being transparent and trying to put people in awkward situations where they are exploited.
Sorry for my long rant I hope it made some sense. Good luck with investing in Salt Lake City or anywhere in Utah I hope this helped a little bit.