Hi mate, with respect to value for money for last year's releases:
2017 Teamcoach - Not great, although there were two wildcards per box. Probably wouldn't get your money back if you sold all the cards from a box.
2017 Footy Stars - Depended on the Brownlow Predictor you pulled. Better than Teamcoach but still probably wouldn't quite get your money back on a box if you pulled an "average" Predictor.
2017 Certified - Depended on if you pulled a medal card or a better card (e.g. guernsey card) as your big hit. If you hit a medal card you probably wouldn't get your money back, if you hit a bigger card you probably would. Much higher potential ceiling on return than any other release.
2017 Future Force - Again, depended on the signature colour you got. To be honest can't really remember what you would get back on a box but I'd say you would go pretty close to getting back what you paid for a box in most cases, and more if you hit a rarer signature colour.
So far this year I'd say you get better value for money for Footy Stars than last year and about the same for Teamcoach.
Hope that helps