I'm sure it's fun, I have fun with plenty of substandard lists. I'm currently working on a Vanilla SM detachment to bring with my Grey Knights for small scale local tourneys that I want to take casually, but that doesn't mean that the list is necessarily viable at a high end competitive level (although it would be viable if flyers weren't so damn busted...)
You submitted a tournament
list for critique, and so I critiqued it from a competitive standpoint. You're more than welcome to accept or ignore that critique, but the fact of the matter is that your list simply will not excel in a competitive environment; several key factors within the metagame will effectively prevent you from doing well in the tournament. This list is pretty much going to kill anyone who isn't able to bring it down. The trick is that people who wouldn't be able to beat this are generally not going to be playing at the top tables, because if you can't deal with this, then you certainly can't deal with the stronger lists in the game. So effectively you'll only be able to beat down on the bottom of the field, so you're basically limiting yourself to placing somewhere in the middle.
But hey, so long as you're aware of that and that's fine with you, then more power to you, I wish you the best of luck at your event and hope you enjoy yourself.
The number of troops in your army is too important to leave to the vagaries of a D3 roll.
You can't take 6 squads of puries and hope to get troops with GS. Of course you need a GM to get GS and I often save the points and take a BC.
If you don't take Crowe you have to spend points on Termies or GKSS to fill the troop slot.
Crowe works just fine if you deploy him with just a little bit of thought.
You see, I see people saying this, but I don't think anyone ever actually plans on bringing 6 squads of purifiers ever, you just don't have enough points for that. I can't see a list bringing more than 3 squads of Purifiers (even that's a lot), and I'd happily bring GKSS to fill up my troop squads. They're one of the best troops in the game for a reason. What do purifiers bring over GKSS in the troop slot? Better combat prowess (in your shooting army), and more psycannons at an inflated cost? I guess Fearless is pretty good, but not enough to justify the cost.
This is assuming you value scoring Purifiers at all, which frankly I don't. They don't need to score. Yes, objectives are important missions, but that doesn't mean that every goddamn model in my army needs to be scoring in order for me to include them.