No. If you have that uncontrollable being down there, I doubt a simple thing like that could stop it. Though it may work on someone else, it entirely depends on how heavy the concept of money is on your mindset after all.
The problem is that, there are people who are lazy enough to not write a diary. Also, many people do not walk the talk they would be able to realize their strive but it could boost them to continue gambling because for them that is an "easier" way of becoming rich, so that they won't again sacrifice just to earn money. These kind of people are dependent and are somewhat addicted to gambling, in which in this case, writing anything won't help them to quit gambling.
It isn't really a matter of lazyiness, just a matter of compatibility. Hell, I wouldn't doubt if someone actually used animals as a way to restrict themselves from gambling. Like how they keep themselves busy with taking care of their pets and the like. There's also a factor of insanity regarding those people whom think of gambling as an "easier" way of earning money. They somehow one way or another have a screw loose in their head imo.