Do you have to have them with every kit?
Have to- no. I do look for them in kits I am considering purchasing.
Do you use them on every page?
I have not always, but lately yes more often than not. It really depends on how lazy I am feeling when I get to the title as it is one of the last steps I do when working on a page. I tend to stick with one kit/collection when scrapping most of the time and I enjoy using them to build my own titles.
Do you have ones that you use over and over?
Yes - some are favorites I have had for many years
Let me know your thoughts about the questions above and anything else you want to share.
A basic, versatile alpha is definitely a kit or collection bonus that can be a factor in my purchase. Unique fancier alphas are also a good thing - something with style that I could not easily recreate myself from a basic font with some layer styles added.