Bigger tanks make things a little easier because they are more forgiving. However, not everyone has the need, desire, room, budget for bigger.
The amount of time and effort to maintain a larger tank isn't much more than a smaller tank. It takes about the same amount of time to clean a skimmer for a 150g than it does for a 75g. In fact with the same bioload, you would most likely have to clean the larger tank less often. But, you would probably not have the same bioload in each. In addition to the added initial cost, there is added electrical costs, salt mix costs, maintenance costs.
I am not against bigger tanks, I just don't know if they are for everyone. Most of the people here are the ones who still love the hobby, so the opinions are skewed. Many started small, upgraded and say they wish they started larger to begin with. Those are people that still enjoy the hobby and stuck with it.
The opinions you will not read here are all the people that started large, got tired of the hobby, and sold all their equipment at a loss. While most people here love the hobby not everyone sticks with it. You won't hear too many people saying that because they don't participate in the these discussions anymore now that they are out of the hobby.
Not everyone has thousands of dollars they can spend on "let me see if I like this hobby."
It is a hard choice. We don't know you. You know yourself better than any of us. Some people get the itch to do something, do it for a short time, then move on. I know there are lots of people who get all enthused and a year later they get enthused about something else. Many of the people that participate in this forum are long term hobbyists.
If you use a spreadsheet you could start listing the cost of various equipment and expenses for 2-3 different size systems, add 20% for all extras, and then compare the bottom lines. Are you willing to spend an extra $500 or $1000 or $2000 to go to next size tank.
You can get an idea from a place like thatpetplace.com they publish their tank prices. They are pickup only in Lancaster PA and your local store will most likely be higher priced but you can get general idea of how much more the tank and stand would be as you go up in size. You can then ask here for suggestions on lighting, skimmers, pumps, for several different size tanks and add that to your spreadsheet.
http://www.thatpetplace.com/pet/shipping/Glass_Aquarium_Listing.pdf
Good luck,
Dave