I know that responding to you with facts is functionally useless, but I have a minute to kill:
1) You will never pay a dime of tax on this facility unless you stay in hotels in your own hometown, take trolley tours, or rent cars at Logan. I grant that this is possible, but on the whole, you are not a taxpayer with respect to this project.
2) The expansion is not necessary because the facility is outdated. It is necessary because it is too small. It is too small because they built responsibly the first time around and left this extra space to Phase 2, which it is now necessary to build.
3) According to the Speaker of the Massachusetts House, the $850 million spent in Phase 1 has generated a $5.3 BILLION return on investment to date. The Wiki page quoted above also mentions that the economic impact of the project is currently about $900 million per year. I grant that the Speaker may be over-optimistic, but he'd have to be exaggerating ROI by over 500% to be wrong about the facility breaking even, ten years after it was built.
http://wwlp.com/2014/03/24/bcec-expansion-bill-inches-closer-to-house-vote/
4) If you read the article above, you will see that the reason the bill sailed through committee was because it requires no new revenue beyond what is already collected in hospitality taxes. The taxes which, remember, you do not pay.