Why don't you ask Man Utd, Arsenal, Chelsea and Man City fans that question.
How can Man U, Arsenal, Chelsea and City all be winning all the time? For one of them to succeed, by definition, another must fail.
Anyway, its not comparable because its pretty much always been a straight race between Celtic and Rangers and the 3rd placed side do be a ridiculous amount of points behind. The way it is now, with Rangers out of the way for 3 years, is worse. Since the PL started 20 years ago there have been five different winners. In that time, and well before it, there have been just either Celtic or Rangers winning the SPL.
Also, the rest of the SPL is not comparable to the rest of the EPL. The quality of the sides outside the big four e.g Spurs, Everton, Newcastle, Liverpool etc. are far greater than Hearts, Motherwell, Dundee Utd etc.
Maybe the truth is a little more off-putting? Maybe you are afraid of being beaten bad and relegated?

