you can predict when you will draw a tag within reason, its a min. of 3 years in CO, if your really serious right now you are probably money and time ahead to go to canada.
unless your planning to move to a western state in the near future the price of a canada sheep is really not out of the question, figure what your going to be doing for the next 5-7 years, family, job, location,it certainly isnt going to get any cheaper, and the draw odds are only going to get worse,
sheep hunting (drawing tags) has changed so much in the last 10-15 years, used to be a CO resident could draw a tag every couple of years, you could rely on that, some areas, you could draw every year, unheard of now.
so dont get discouraged just figure out do you really want to do this, its exspensive and thats just the start,but do some homework, and check out those raffle tags the money goes directly to sheep management, not some deep dark gov. hole, and you have the same chance as everyone else to win the tag of a lifetime.