I will never understand the logic behind people wanting to bench players for "impact", it's just stupid in todays game. You just don't have the luxury of making multiple interchanges to get them on and off again so you just won't get the minutes out of them that you need.
Your best forwards should start becauae they're the highest paid and they're the most reliable over longer stints while the less reliable start off the bench. Obviously there are some exceptions, but benching Klemmer or Woods is just idiotic, just like benching Bromwich, Fifita, Taumalolo, Vaughan, etc would be.