This sentence, which is dark in humor, can be considered funny or ironic, as it intermingles a serious and sensitive real-life issue with a lighter and more casual approach applied in the money-saving tip context. It’s important to note that it heavily relies on the type of humor appreciated by the reader, and it's indeed not suitable for everyone.
The humor part is embedded in the way it employs an unlikely and unorthodox solution (using stairs) to a situation that normally would involve significant expenses (having an abortion). Applying a money-saving tip to such a serious matter presents an ironic twist that some may find humorously absurd.
Additionally, there is irony in the friction between the gravity of the issue and the triviality of the suggested solution. An abortion, which is a complex and controversial topic involving ethics, morality, and personal belief, is presented with a solution as simple and mundane as using the stairs. The blunt and casual way the sentence is delivered is a radical departure from the emotional weight and sensitivity usually associated with this topic.
The sentence also plays around the guidance column format, where the narrator promises to come back next week with more money-saving tips - a common promising line in many personal blogs or advice columns. By applying this format to such unconventional advice, it further adds to the absurdity and humor the sentence is attempting to communicate.
Additionally, the use of "I'll be back" conveys the narrator’s nonchalance towards the profound impact of the decision. This throwaway comment highlights the disconnect between the seriousness of the situation and the narrator's casual attitude, reinforcing the irony of the statement.
To conclude, the humor or irony intended in this sentence is predicated on surprise: the startling contrast between its serious subject matter and comically absurd proposed solution. However, it is a contentious line, as many may find it offensive or inappropriate, given the sensitivity of the topic it handles. Paying for her abortion makes no sense when stairs are free I ll be back next week with more money saving tips