money vs time vs comfort

from hk airport i plan to go to hong kong island. most of information in airport are pointing to airport express which is hk100 one way n hk180 return. kind of expensive for me. i'm looking for cheaper way so decide to take airport bus. from some of bus information found in airport wall, i guess a11 or e11 will go to central where i can just walk to pier7 for the ferry. Somehow a11 cost 40hk while e11 cost only 21hk. Dont really care why, i went to buy e11 ticket in the counter but they only sell a11. for e11 i need to buy on the bus. ok then, i queue at e11 stop n waited abt 15 mins. the bus reach... but it only accept exact amount. damned.. . i have 51hk  and the bus driver are screaming ask me to be fast n want to close the door. reluctantly i force myself down. now i know that 20hk cheaper come with a price. i just wasted my 15 mins queue.  went back to the counter n i surrender my 40hk on a11 for the exchange of another 20mins of waiting. without a wait, the a11 bus is already at the bus stop n i just walk n board. how a 20hk make a different on time spend waiting n comfort of need to hv small change etc. then come the second part. for a11 bus, there are 2 stop for central. city hall n admiral.  i choose admiral as it sounded more like water yet the driver didnt stop there but it stop at the next stop which kind of far from the central. i just got down n plan to take the opposite bus to central back. i crossed the road back n forth to understand where am i n the bus route as i can't find admiral or city hall on all the bus route. cant find bus a11 route on the bus stop either. i spend sometimes to understand how much the fare n get small change for my money as they only accept exact fare. sigh. if i willing to spend that 100hk, i just need to walk out n pier7 on my left. 

going back to airport, i decided enough with the cheapskate n go with safer n easier option. so i took the airport express.  all sign is easy to understand , there are vending machine to buy tic, easy access to air shuttle... n no more misfortunate :). i guess next time, if i want to save some money n time is limited, i need to do some preparation ahead rather then just jump n hope thing will be alright.