I understand what you are saying but I think it is more a case of staying focused and positive instead of you actually getting bored with the principles of "LOA". I know personally I have had many life changing things happen since utilising the techniques, however it took me a while to re-train my subconsious (for want of a better descriiption) so there were times when I felt I had to read eveything available on "LOA" just to find a new technique or angle.
Now I realise it doesn't work that way. It is something you are as apposed to something you can physically do. I find that vision boards are great as you can modify and change them daily to suit your mood and desires. Also you tend to get less unmotivated if you can visually see what you are manifesting into your life.