it all depends on how hard you intend to grind with your char, yes without a golden ticket service it will be more harsh so i wouldn't advice leveling/grinding after 45 without a gt!
i'm lvl50 atm and ever since level 43 i've held my max masteries at 43 in order to pharm some sp, i leveled to 50 last night btw with a 6 gap using a gt. in those 3 hours of gt service i can grind 1500sp and get +20% experience each session (49 to 50 took me a small week). now at level 50 with a 7 gap i still get the same amount of sp pharmed but only the grinding will get me +10% experience, and that will get worse when i hit 51 and after that 52

might take a 2/3 weeks that i levelup to 52
i don't mind though, i'm doing it for the sp and it seems that so will you!

you might stick to a certain level for a week or maybe even longer, but in the long run it will pay off once you see that 20/30k+ sp in your sysbar!