Alas, this is my experience too. I'm aware of "landlord safety certificates" and "landlord electrical certificates" being offered at £40. I'm also aware of a supposed electrician who claims that he can carry-out four EICRs a day. Seriously. I must be slowing-down badly in my old age as it takes me on average around four hours to do an EICR. It just isn't possible to carry-out four EICRs a day on domestic properties unless, of course, much of the testing is being omitted.
One rogue landlord offered me £50 to change a C2 code to a C3 so he could have the report signed-off as satisfactory! I told him where to go. Most landlords that I deal with take their responsibilities seriously and won't compromise the safety of their tenants to save themselves some money. But there are certainly rogues out there who are concerned only with making as much rental income as possible with minimum outlay.