[QUOTE=Soju;6827274]Being Suvarnabhumi is a bit further from central Bangkok than Don Muang, and given that prices of just about everything go up over time, I don't know that I'd call it a ripoff myself.

YES its very poor value, as f.e. the Airport-Pattaya direct bus (122 kms they say) is just 106 bt of a FAR better bus with service onboard too.
Of the citybuses: 557 does NOT exist nor has ever been. From 15/12 several changes wil be made, the 552A and 553 are to merge.
nr 552 runs all along Sukhumvit from bangNa/crossing (HEAVY delays can be expected, alkso due to construction of skytrain extension and folows Sukhumvit all the way till ASOKE, then turns left on it and ends at the garage in Klong Toey.
The citybuses are mainly aiminng at airportworkers (most of whom still live in the DonMuang area) which explains why so many/frequent rouites go to there. ALL fares to/fro the airport itself are 35 baht. (you can pre-buy coupons giving 10% discount).